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This SciShow video is supported by Brilliant. As a SciShow viewer, you can keep building your STEM skills for 20% off an annual premium subscription at Brilliant.org/SciShow. [ intro ] If a tree falls in a forest and doesnt decompose, what happens to it? Well, like all living things on Earth, trees are mostly made of carbon. And, if that tree happened to exist some 300 million years ago, that carbon might have turned into coal. In fact, we can thank ancient fallen forests for essentially the worlds entire supply of coal, the burning of which made things like steam engines and the entire Industrial Revolution possible. Of course, it has also caused some serious climate problems. And while we look to uncover some of the secrets of these coal-forming forests, we can also focus our efforts on getting that carbon out of the atmosphere and back where it came from. Carbon is vital to all life on Earth. We find it everywhere, from the bodies of living organisms, to the seawater and